The only traditional method of flat glass making left is the cylinder process (known as broad or sheet glass). This is now used in restoration projects that would originally have utilised crown glass.
Glass is gathered on the end of a pipe and placed on a block of hollowed-out wood. The glass is blown and then re-heated. The blower swings the glass "pipe" in a vertical plane until it is elongated into a cylinder.
The cylinder is then split down lengthways.
The split glass is then re-heated and flattened on a smooth stone and then annealed.
This process allows the colour range to b limitless; the glass is used ecclesiastically, commercially, domestically and for restoration purposes. It is also easier to make in comparison to any of the other processes.
Crown Glass is gathered and heated.
Molten glass is blown and spun to a small globe.
Re-heating is ongoing.
Skilled glassblowing and re-heating forms a cylinder.
Cooled crown glass cylinders ready for splitting, flattening and annealing.